Perhaps you should try some spelling variations:
thanh trung » thanh tung
phuong cong » phuong dong, phong cong, phung cong
chieu tach » chiet tach, chieu sach, chieu tinh
hanh tang » hanh trang, anh tang, hanh mang
va phuong » va thuong, cac phuong
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cao » toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu tach) OR (chiu trach)) - ((hanh tang) or (thanh trung)) va phuong cong tan toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu tach) OR (chiu trach)) - ((hanh tang) OR (thanh trung)) va phuong cong tan toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu tach) OR (chiu trach)) - ((hanh tang) or (thanh trung)) va phuong cong tan toan cao".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu tach) OR (chiu trach)) - ((hanh tang) or (thanh trung)) va phuong cong tan toan cao*.